Not bad at all
I really like the energy that you've got going in this. As it moves on, it definitely settles into a nice groove. The only issue I have with it is what the previous poster said about it. That Eb on the F9/A just doesn't sound strong though. It wouldn't sound so jarring if it was over an F and not an A because you get the tritone clash between the melody and the bass.
Also, looking over what the chord progression is, I would have to say that it's actually more in C than it is in F. Reason being that you go from a C to a Cmaj7, which would be the dominant of F. In order for it to work as being in F, you'd have to go down to a C7 instead of a Cmaj7. I think (and this is just my opinion) that a less jarring chord progression for it would be C-Cmaj7-Bb-F-F/A-Fadd9/A-Bb-F. So basically the same thing, only getting rid of that seventh on the F9 (which is actually what's making it seem like it's changing key, because it is. You're hitting a V7-I with that F9-Bb).
Other than that, great job. (Sorry for the ridiculously nitpicky review. The song is great, so the nitpicky details are all that needed to be said)